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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>setlocale</span></span></strong></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="localeconv.html" title="c/locale/localeconv"><span class="t-lines"><span>localeconv</span></span></a></div></div></td></tr>
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<tr class="t-nv-h2"><td colspan="5"> 本地环境类别</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="LC_categories.html" title="c/locale/LC categories"><span class="t-lines"><span>LC_ALL</span><span>LC_COLLATE</span><span>LC_CTYPE</span><span>LC_MONETARY</span><span>LC_NUMERIC</span><span>LC_TIME</span></span></a></div></div></td></tr>
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<td> <div>定义于头文件 <code>&lt;locale.h&gt;</code>
 </div></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl">
<td class="t-dcl-nopad"> <div><span class="mw-geshi c source-c"><span class="kw4">char</span><span class="sy2">*</span> setlocale<span class="br0">(</span> <span class="kw4">int</span> category, <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> locale<span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p><code>setlocale</code> 函数安装指定的系统本地环境或其一部分，作为新的 C 本地环境。修改保持效果，并影响所有关乎本地环境的 C 库函数执行，到下次调用 <code>setlocale</code> 为止。若 <code>locale</code> 为空指针，则 <code>setlocale</code> 查询当前 C 本地环境而不修改它。
</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
<table class="t-par-begin">


<tr class="t-par">
<td>  category
</td>
<td> -
</td>
<td> 本地环境类别标识符， <a href="LC_categories.html" title="c/locale/LC categories">LC_xxx</a> 宏之一。可为 0 。
</td></tr>
<tr class="t-par">
<td>  locale
</td>
<td> -
</td>
<td> 系统限定的本地环境标识符。对于操作系统的环境支持字段为命令行“locale -a”的合法列出内容值，对于用户偏好的本地环境为 <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">""</span></span></span> ，对于最小本地环境为 <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">"C"</span></span></span> 。
</td></tr></table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
<p>指向窄空终止字符串的指针，它表示应用更改后的 C 本地环境，若存在。或在失败时为空指针。
</p><p>返回字符串的副本和到 <code>setlocale</code> 的此调用中所用的类别，可在程序的后面用来恢复本地环境到此调用结束时的状态。
</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
<p>程序启动过程中，运行任何用户代码前会执行 <span class="t-c"><span class="mw-geshi c source-c">setlocale<span class="br0">(</span><a href="LC_categories.html"><span class="kw903">LC_ALL</span></a>, <span class="st0">"C"</span><span class="br0">)</span><span class="sy4">;</span></span></span> 的等价代码。
</p><p>尽管返回类型为 <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">char</span><span class="sy2">*</span></span></span> ，修改被指向的字符是未定义行为。
</p><p>因为 <code>setlocale</code>修改影响依赖本地环境的函数执行的全局状态，故而一个线程调用它，同时另一个线程执行任何下列函数是未定义行为：<span class="t-lc"><a href="../io/fprintf.html" title="c/io/fprintf">fprintf</a></span> 、 <span class="t-lc"><a href="../string/byte/isprint.html" title="c/string/byte/isprint">isprint</a></span> 、 <span class="t-lc"><a href="../string/wide/iswdigit.html" title="c/string/wide/iswdigit">iswdigit</a></span> 、 <span class="t-lc"><a href="localeconv.html" title="c/locale/localeconv">localeconv</a></span> 、 <span class="t-lc"><a href="../string/byte/tolower.html" title="c/string/byte/tolower">tolower</a></span> 、 <span class="t-lc"><a href="../io/fscanf.html" title="c/io/fscanf">fscanf</a></span> 、 <span class="t-lc"><a href="../string/byte/ispunct.html" title="c/string/byte/ispunct">ispunct</a></span> 、 <span class="t-lc"><a href="../string/wide/iswgraph.html" title="c/string/wide/iswgraph">iswgraph</a></span> 、 <span class="t-lc"><a href="../string/multibyte/mblen.html" title="c/string/multibyte/mblen">mblen</a></span> 、 <span class="t-lc"><a href="../string/byte/toupper.html" title="c/string/byte/toupper">toupper</a></span> 、 <span class="t-lc"><a href="../string/byte/isalnum.html" title="c/string/byte/isalnum">isalnum</a></span> 、 <span class="t-lc"><a href="../string/byte/isspace.html" title="c/string/byte/isspace">isspace</a></span> 、 <span class="t-lc"><a href="../string/wide/iswlower.html" title="c/string/wide/iswlower">iswlower</a></span> 、 <span class="t-lc"><a href="../string/multibyte/mbstowcs.html" title="c/string/multibyte/mbstowcs">mbstowcs</a></span> 、 <span class="t-lc"><a href="../string/wide/towlower.html" title="c/string/wide/towlower">towlower</a></span> 、 <span class="t-lc"><a href="../string/byte/isalpha.html" title="c/string/byte/isalpha">isalpha</a></span> 、 <span class="t-lc"><a href="../string/byte/isupper.html" title="c/string/byte/isupper">isupper</a></span> 、 <span class="t-lc"><a href="../string/wide/iswprint.html" title="c/string/wide/iswprint">iswprint</a></span> 、 <span class="t-lc"><a href="../string/multibyte/mbtowc.html" title="c/string/multibyte/mbtowc">mbtowc</a></span> 、 <span class="t-lc"><a href="../string/wide/towupper.html" title="c/string/wide/towupper">towupper</a></span> 、 <span class="t-lc"><a href="../string/byte/isblank.html" title="c/string/byte/isblank">isblank</a></span> 、 <span class="t-lc"><a href="../string/wide/iswalnum.html" title="c/string/wide/iswalnum">iswalnum</a></span> 、 <span class="t-lc"><a href="../string/wide/iswpunct.html" title="c/string/wide/iswpunct">iswpunct</a></span> 、 <span class="t-lc"><strong class="selflink">setlocale</strong></span> 、 <span class="t-lc"><a href="../string/wide/wcscoll.html" title="c/string/wide/wcscoll">wcscoll</a></span> 、 <span class="t-lc"><a href="../string/byte/iscntrl.html" title="c/string/byte/iscntrl">iscntrl</a></span> 、 <span class="t-lc"><a href="../string/wide/iswalpha.html" title="c/string/wide/iswalpha">iswalpha</a></span> 、 <span class="t-lc"><a href="../string/wide/iswspace.html" title="c/string/wide/iswspace">iswspace</a></span> 、 <span class="t-lc"><a href="../string/byte/strcoll.html" title="c/string/byte/strcoll">strcoll</a></span> 、 <span class="t-lc"><a href="../string/wide/wcstof.html" title="c/string/wide/wcstof">wcstod</a></span> 、 <span class="t-lc"><a href="../string/byte/isdigit.html" title="c/string/byte/isdigit">isdigit</a></span> 、 <span class="t-lc"><a href="../string/wide/iswblank.html" title="c/string/wide/iswblank">iswblank</a></span> 、 <span class="t-lc"><a href="../string/wide/iswupper.html" title="c/string/wide/iswupper">iswupper</a></span>、 <span class="t-lc"><a href="../string/byte/strerror.html" title="c/string/byte/strerror">strerror</a></span> 、 <span class="t-lc"><a href="../string/multibyte/wcstombs.html" title="c/string/multibyte/wcstombs">wcstombs</a></span> 、 <span class="t-lc"><a href="../string/byte/isgraph.html" title="c/string/byte/isgraph">isgraph</a></span> 、 <span class="t-lc"><a href="../string/wide/iswcntrl.html" title="c/string/wide/iswcntrl">iswcntrl</a></span> 、 <span class="t-lc"><a href="../string/wide/iswxdigit.html" title="c/string/wide/iswxdigit">iswxdigit</a></span> 、 <span class="t-lc"><a href="../string/byte/strtof.html" title="c/string/byte/strtof">strtod</a></span> 、 <span class="t-lc"><a href="../string/wide/wcsxfrm.html" title="c/string/wide/wcsxfrm">wcsxfrm</a></span> 、 <span class="t-lc"><a href="../string/byte/islower.html" title="c/string/byte/islower">islower</a></span> 、 <span class="t-lc"><a href="../string/wide/iswctype.html" title="c/string/wide/iswctype">iswctype</a></span> 、 <span class="t-lc"><a href="../string/byte/isxdigit.html" title="c/string/byte/isxdigit">isxdigit</a></span> 。
</p><p>POSIX 亦定义名为 "POSIX" 的本地环境，它始终可访问，并准确等于默认的最小 "C" 本地环境。
</p><p>POSIX 亦指定后继的 setlocale 调用可以非法化返回的指针，而不仅是被指向的字符串内容。
</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">运行此代码</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="co2">#include &lt;stdio.h&gt;</span>
<span class="co2">#include &lt;locale.h&gt;</span>
<span class="co2">#include &lt;time.h&gt;</span>
<span class="co2">#include &lt;wchar.h&gt;</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
    <span class="co1">// C 本地环境将为启用 UTF-8 的英文；</span>
    <span class="co1">// 小数点将为德文</span>
    <span class="co1">// 日期和时间格式将为日文</span>
    setlocale<span class="br0">(</span><a href="LC_categories.html"><span class="kw903">LC_ALL</span></a>, <span class="st0">"en_US.UTF-8"</span><span class="br0">)</span><span class="sy4">;</span>
    setlocale<span class="br0">(</span><a href="LC_categories.html"><span class="kw907">LC_NUMERIC</span></a>, <span class="st0">"de_DE"</span><span class="br0">)</span><span class="sy4">;</span>
    setlocale<span class="br0">(</span><a href="LC_categories.html"><span class="kw908">LC_TIME</span></a>, <span class="st0">"ja_JP"</span><span class="br0">)</span><span class="sy4">;</span>
 
    <span class="kw4">wchar_t</span> str<span class="br0">[</span><span class="nu0">100</span><span class="br0">]</span><span class="sy4">;</span>
    <a href="../chrono/time_t.html"><span class="kw524">time_t</span></a> t <span class="sy1">=</span> <a href="../chrono/time.html"><span class="kw513">time</span></a><span class="br0">(</span><a href="../types/NULL.html"><span class="kw103">NULL</span></a><span class="br0">)</span><span class="sy4">;</span>
    <a href="../chrono/wcsftime.html"><span class="kw518">wcsftime</span></a><span class="br0">(</span>str, <span class="nu0">100</span>, L<span class="st0">"%A %c"</span>, <a href="../chrono/localtime.html"><span class="kw520">localtime</span></a><span class="br0">(</span><span class="sy3">&amp;</span>t<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fwprintf.html"><span class="kw865">wprintf</span></a><span class="br0">(</span>L<span class="st0">"Number: %.2f<span class="es1">\n</span>Date: %Ls<span class="es1">\n</span>"</span>, <span class="nu16">3.14</span>, str<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>可能的输出：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">Number: 3,14
Date: 木曜日 2014年11月06日 09時58分56秒</pre></div></div> 
</div>
<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">引用</span></h3>
<div class="t-ref-std-11">
<ul><li> C11 standard (ISO/IEC 9899:2011): 
</li></ul>
<dl><dd><ul><li> 7.11.1.1 The setlocale function (p: 224-225)
</li></ul>
</dd></dl>
<div class="t-ref-std-c99">
<ul><li> C99 standard (ISO/IEC 9899:1999): 
</li></ul>
<dl><dd><ul><li> 7.11.1.1 The setlocale function (p: 205-206)
</li></ul>
</dd></dl>
<div class="t-ref-std-c89">
<ul><li> C89/C90 standard (ISO/IEC 9899:1990): 
</li></ul>
<dl><dd><ul><li> 4.4.1.1 The setlocale function 
</li></ul>
</dd></dl>
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="LC_categories.html" title="c/locale/LC categories"> <span class="t-lines"><span>LC_ALL</span><span>LC_COLLATE</span><span>LC_CTYPE</span><span>LC_MONETARY</span><span>LC_NUMERIC</span><span>LC_TIME</span></span></a></div></div>
</td>
<td>  <span class="t-c"><span class="mw-geshi c source-c">setlocale</span></span> 所用的本地环境类别 <br> <span class="t-mark">(宏常量)</span> </td></tr>

</table></div>
</div>

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